Ignition coil



Patented Apr. 21,1925.

UNITED STATES PATENT oEElcE.' i

CHARLES H. CAINE, OF CHICAGO, ILLINOIS, ASSIGNOR TO BROWN`& CAIN, INC., Ol'

CHICAGO', ILLINOIS, A CORPORATION OF ILLINOIS.

IGNITION COIL.

Application led August 2, 1923. Serial 1ro. 655.151.

To all 'whom it may concern:

Be it known that I, CHARLES H. CAINE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinols, have invented a certain' new and useful Improvement in Ignition Coils, of which the following is a full, clear, concise, and exact description, reference being had to thel accompanying drawings, forming a' part of this specification.

My invention relates to ignition coils, such as are commonly employed in connection with providing ignition for internal combustion engines.

The object-of the present invention is to provide a universal coil which will be useful 1n different systems and may readily be employed on various types of mounting. A further object is to provide an improved construction and assembly of induction coil, which will be permanent and rugged in construction and which will ygive superior results in operation.

According to my invention, I provide an interchangeable clamping base plate which may be removed from the coil.- and replaced with a different form of plate to fit the same coil for various types of mounting so that the repair man or dealer need not carry a great supply of coils in stock, and Vyet will be able to meet the requirement for various types of mounting by kee ing in stock only a variety of the clamping ase plates.

A. further advantage of my invention resides in the construction of the coil in which I employ structural supporting features for electrical or magnetic purposes, so that the least possible material is required to give both a rugged and substantial mechanical construction and a highly ecient electrical and magnetic device.

In order to explain to those skilled in the art the manner of constructing and operating my invention, I shall now describe a particular embodiment of the same in connection with the accompanying drawings.

Fig. 1 is a top plan view of a coil embody my inventlon;

Iig.. 2 is .a side elevational view of the same' Fig. 3 is a right hand end elevation; and Fig. 4 is a longitudinal section showing the base plate and taken on the line 4 4 of Fig. 2;

Fig. 5 is longitudinal vertical section taken on the ine 5-5 of Fig. 1; and

Fig. 6 is a transverse sectional view taken on t'he line 6 6 of Fig. 1;

Fig. 7 1s a dia am of connections; Fig. 8 1s an en view of one of the insulatm caps for the coil'; and

Ycoil 2 w ich will be more fully described later is mounted in the upper clrcular portion of the sleeve 1, while a condenser 3 is mounted 1n the lower flat portion. The

ig. 9 is an-- isometric view of a terminal sleeve '1 bears three electrical terminals,-

namely, thebattery terminal 4, the `central high tension terminal 5, and the interruptor terminal 6. These terminals are secured as by means of rivets to the shell or sleeve 1, and are thereby insulated from each other and from other parts of the structure. The ends of the sleeve are closed by metallic caps 7 and 8, which are preferably heavy punchings of soft iron, and which have suitable flanges for embracing the outer edges of the sleeve 1. These end caps also have dependin lugs 9 and l0 spaced a short distance be ow the dat bottom ortion 11 of the sleeve l to which depen ing lugs is secured as by means ofthe short countersunk machine screws 12 a base plate 13, which is also made of magnetic material, preferably soft iron or steel. This base plate may be made of non-metallic material. The base plate shown herein has the two lugs or ears 14: and 15 by. which it may be suitably mounted upon a platform or support on the automobile or the like, in which it is emplo ed. rlhe particular base plate 13 with the ugs 14 and 15 is but one of a series of similar iron base plates which I may employ, all having the four bolt holes for the clamp'n screws 12 to connect them to the endeaps and 8 in the same manner as the base late 13 is supported, each of which base p ates is there ore interchangeable so far as connection with the end plates 7 and 8 is concerned, but which is adapted for a diierent type of mounting on the support or frame lates 7 and 8, are adapted to be'groilnded y being clampe/d upon the proper mountt will bel appreciated that "once the base plate 13 is mounted on a platform or sup- Y port that no amount of vibration or jarring dual 'function of holding the end plates 7 and 8 firmly upon the ends of the sleeve l,

i of holding the frame 21 of the resistance coil 22 firmly in place upon the end plate 8, and serving as a part of the magnetic path, at the same time. In addition, it serves the purpose of holdin the magnetic. end plates 23 and 24 upon t e caps of insulation 25 and 26, which embrace the ends of the windings 27 and 28.

The winding 28 is a low tension winding, one end of which is connected as b means of the conductor 29 to a brass termlnal clip 30, which has one upturned end 31 adapted to make connection with the Wire, and a similar downturned end 32 adapted to lie 1n the slots 33 of the magnetic end plates.

The secondary winding 27 is separately wound and mounted upon a sleeve of insulating material 35, and .is wrapped on its outei` surface with the varnished cambric insulation 36, and is thereafter telescoped over the primary Winding. The ends of the windings are protected by the caps 25 and 26, which are preferably made of bakelite, hard rubber, or the like, and which have the central aperture 37, as illustrated in Fig. 8 with openings adjacent thereto adapted to receive the bushings 38. These bushings are adapted to lead out the terminals of the coils through the magnetic plates 23 and 24. As above explained, the one terminal of the primary winding is connected to the'longitudinal bolt 17 as the nut 40 clamps the terminal clip 30 securely under it. opposite end of the bolt a nut 41 presses againstthe dise of insulation 42, holding the magnetic plates 23 and 24 and the caps 25 and 26 securely upon the ends of the foil. The opposite end of the primary Winding is connected by Wire 44 to the terminal 4 and then to battery 5, as indicated in Fig. 7.

The terminals of the secondary Winding comprise the Wire 45 which leads to the high tension terminal 5, and the Wire46 which extends out through the bushing 38, as shown in Fig. 6, and is connected to the grounded shell 47 of the condenser 3. This shell which is made of magnetic material to afford an easier path of travel vfor the magnetic flux which Nissues from the magnetic core 16, is connected to ground through a flat strap or strip of brass or'copper, shown at 48 in the lower left hand corner of Fig. 5, extending from the shell of the condenser to a part of the inturned flange of the cap 7 where this connection is securely soldered. The shell 47 of` the condenser 3 is riveted -to the bottom part 11 of the sleeve- 1, and one side ofthe condenser is grounded to said shell 47, the other terminal of the condenser being connected throufrh a bushing of insulation 48 by Way of wire 49 to the terminal 6. This terminal 6 is further connected by the extendin bracket arm 50 leading from the frame o the resistance coil 22 to said terminal 6, as is apparent from Figs. 2 and 3. The terminal 6 is also connected to the ance coil 22 is a coil of tine iron wire, or the like, which is adapted to heat up and interpose a thermal resistance if current is left owing through the coil to a degree which might otherwise injure the Winding. This coil is formed in the shape of a helix mounted upon the block of insulation 21 which forms the main frame of the support, one end of said coil being connected to the bracket 50, and the other end being connected to the protecting cap 51, which cap is electrically connected 'with the bolt or stud 17. The arm 50 is insulated from the bolt or stud 17.

The magnetic discs 23 and 24, Which are clamped against the end caps 25 and 26, are provided With laterally extending lugs 53 and 54, which are riveted to the side walls of the sleeve member 1, thereby firmly supporting the coil in place within the shell o1' sleeve, Without imposing any strain upon the end plates 7 and 8. Instead of a single disc 23 or 24 at the ends of the coil` a plurality of such magnetic discs may be p-rovided, the outer one.; of which, however, are the only ones which are Iprovided with the supporting legs such as 53, 54. These magnetic disks are slotted from their periphery to a point adjacent the central hole for the bolt or stud 17. This is todiminish the effect of hysteresis 'and eddy current losses. The terminal and washer members 30 have extending arms 31 or 32 extending into said slots to prevent turning of the terminal When the corresponding nuts 40 and 41 are drawn up.

The action of the coil as a Whole is highly satisfactory. The relatively loose and separated magnetic return circuit furnishes a good magnetic path which is readily magnetized and demagnetized." This'return path is composed almost Wholly of necessary structural parts and therefore is secured at minimum cost. Furthermore, the cooperatcaps.

ing parts of the structure are so proper-having a magnetic housing disposed within said sleeve, said magnetic housing extending substantially the distance between said magtioned and arranged that they perform the ma etic function satisfactorily without inter ering with their mechanical and electrical functions and vice versa.

I do not intendto be limited to the details shown.

I claim 1. In combination, a shell of insulating material, metal end caps closing said shel said end caps havin depending portions, a magneticcore having windings disposed within the shell, a bolt assing irough the end caps and through t e core and holding the same together in permanent relation,

and a clamiing base plate removably secured to sai depending portions ofthe end 2. In combination, a shall of insulating material of generally cylindrical rontour,

, metallic end caps having flanges embracing the ends of the' sleeve, depending lugs on said end caps, means for holding said caps upon said sleeve, and a magnetic base plate removably secured to said depending lugs. 3. In combination, a sleeve of insulating material, metallic end caps for the same, an induction coil mounted within said sleeve, said coil comprising a central magnetic core, windings surrounding said core, a clamping bolt for holding thecaps upon the sleeve passing through said magnetic core, said bolt being insulated from said caps.

4. In combination, a magnetic core, windings surrounding said core, end caps of iiisulation surrounding the ends of the windin plates of magnetic material lying outsi e of said end caps, and a condenser connected to said windings, said condenser having a magnetic shell extending longitu-l dinally of the coil and being disposed adjacent said magnetic plates.

5. In combination, a sleeve of insulating material, an induction coil disposed within said sleeve, said induction coil comprising a magnete core, windings about said core, caps of insulating material enclosing' the ends of the windings, magnetic plates lying outside of said caps, said plates having lugs secured to the inside walls of said sleeve,

and a bolt passing through the plates and through` said magnetic core to hold the plates, the caps, the coils and the core together.

6. In combination, a sleeve of insulating material, an induction coil disposed within .said sleeve, said induction coil comprising a magnete core, windings about said core, caps nf insulating material enclosing the ends of the windings, magnetic plates lying outside of said caps, said plates having lugs secured to the inside walls of said sleeve, and a bolt passing through the plates and through said magnetic core to hold the plates, the caps,

` the coils and the core together, a condenser 8. In combination, a sleeve of insulating' material, an induction coil disposed within said sleeve, vsaid coil comprising a central magnetic core, windin disposed about said core, insulating mem ers at the ends of said windings, magnetic plates having lugs secured to the inside walls of the sleeve, caps for the ends of the sleeve, and a bolt passing through said caps, through said plates, through said insulating members and through said magnetic core for holding said parts together, a removable clam ing base late secured to the end plate, said ase plate ing ada ted to be grounded and said bolt being ins ated from said end plates.

9. In combination, a sleeve of insulation containing an induction coil and condenser,

terminals mounted upon said sleeve, end caps for the sleeve permanently mounted upon the ends of the sleeve, and an interchangeable base plate removably secured to y the end plates.

10. In combination, a sleeve of insulation, a coil inside of said sleeve, said coil comprising a magnetic core, end plates of magnetic material closin said sleeve, said core being spaced from said end plates, a magnetic bolt passing through said end plates and core for holding the parts securely and permanently in position, and a magnetic clampin base plates removably secured to said en plate.

11. In combination, a sleeve of insulating material, end caps of magnetic material closing said sleeve, a coil in said sleeve comprising a magnetic core, windings surrounding the magnetic core, end pieces of insulation at the ends of said coil, plates of` magnetic material having lugs extending to the side walls of the sleeve and secured thereto, means for holding the core and plates togetherand for holding the caps upon the ends of the sleeve, and an interchangeable base plate member of magnetic material connecting said caps.

12. In combination, a sleeve, a air of end plates connected to the sleeve, sai end plates having lugs lying in a common plane, holes in said lugs, a changeable base plate having holes registering with the holes in said lugs and screws passing through said holes for removably clamping the plate to said lugs, said base plate having fastening means adapted 4to hold it `flat against a supporting surface and to prevent removal of said screws.

13. In combination, a sleeve, a pair of end plates connected to the sleeve, said end p lates having lugs spaced from the adjacent side Wall of the sleeve, holes in said lugs, a

Lus-135s changeable base plate having holes registering with the holes in said lugs and screws passing through said holes for removably clamping the plate to said lugs, said base plate having fastening means adapted to holdit Hat against a vsupporting surface and to prevent removal of said screws.

In Witness whereof, I hereunto subscribev 

